package com.hxy.ssm.interceptor;

import com.hxy.ssm.bean.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request , HttpServletResponse response, Object handler) throws Exception{
        //获取请求的URL
        String url = request.getRequestURI();
        //URL：除了login.jsp是可以公开访问的，其他的URL都进行拦截控制
        if (url.indexOf("/login")>=0||url.contains("layui.css")||url.contains("layui.js")||url.contains("style.css")||url.contains("b1.jpg")||url.indexOf("/register")>=0){
            return true;
        }
        //获取Session
        HttpSession session =  request.getSession();
        User user = (User) session.getAttribute("USER_SESSION");
        //判断Session中是否有用户数据，如果有，则返回true，继续向下执行
        if (user != null){
            return  true;
        }
        //不符合条件的给出提示信息，并转发到登录页面
        request.setAttribute("msg","您还没有登录，请先登录!");
        request.getRequestDispatcher("/login.jsp").forward(request,response);
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest request , HttpServletResponse response, Object handler, ModelAndView modelAndView)throws Exception{

    }
    @Override
    public void afterCompletion(HttpServletRequest request , HttpServletResponse response, Object handler,Exception ex)throws Exception{

    }
}

